Hi
I am about to embark on upgrading from 1.5.1 to 1.5.5.

I have created a test environment where I have uploaded all the new 1.5.5 cart files (the idea is to use the new files rather than the existing ones and then add any plugins I require afterwards.) and made a clone of the old database.

So new set of files but old database.

The problem I have is trying to upgrade the old database as part of the zc_install process.

I read the instructions about upgrading the Db which seems to require an old version of the config files to activate this route. (Maybe wrong) So I copied my old config files over to the new file set which brought up the Old config files need updating screen but clicking update doesn't take me anywhere.

Any idea where I am going wrong?